Why do the Jews have three glasses of wine to celebrate the passover?

Four glasses of wine are drunk during the seder. The red wine at the seder symbolises HaShem's four statements of redemption in the Torah:

1. "I took you out"

2. "I rescued you"

3. "I liberated you"

4. "I took you to Me for a people"

The wine represents redemption while the colour of the red wine reminds us of the blood of the children killed for the Pharaoh.